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Updated: Jan 22, 2026

Light-Induced In Situ Transmission Electron Microscopy for Observation of the Liquid-Soft Matter Interaction
Published on: July 26, 2022
Soft giant magnetoimpedance electronics enable contact-free human-machine interactions
Yizhang Wu1, Sicheng Xing1, Dingyi Yang2,3
1Department of Applied Physical Sciences, University of North Carolina, Chapel Hill, NC 27599.
Abstract:
Magnetic sensing enables contact-free, three-dimensional human-machine interactions (HMI) with high selectivity and resilience to environmental noise. However, conventional magnetic films, mostly obtained via vacuum deposition, remain constrained by rigidity, instantaneous response, and single-mode. Here, we report a giant magnetoimpedance ionogel (GelGMI) in which electrostatically self-assembled ferromagnetic (FM) domains are uniformly dispersed in a soft ionogel matrix. Under a magnetic field, domain moments realign to reconfigure ionic pathways, yielding pronounced magnetoimpedance while maintaining performance at >1,000% strain and across orientations. The hysteretic relaxation of domain magnetization imparts retrospective neuron-like temporal summation, realizing sequence- and context-aware interaction. In addition, the self-healable matrix supports a complementary tactile mode whose impedance contrasts with contact-free magnetic proximity, enabling expandable and bimodal recognition. GelGMI delivers a record-high sensitivity while unifying stretchable, neuromorphic, and healable capabilities for contact-free HMI systems.
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